HOT HYDROGEN IN DIFFUSE CLOUDS

被引：5

作者：

Cecchi-Pestellini, Cesare ^{[1
]}

Duley, Walt W. ^{[2
]}

Williams, David A. ^{[3
]}

机构：

[1] INAF Osservatorio Astron Cagliari, I-09012 Capoterra, Italy

[2] Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada

[3] UCL, Dept Phys & Astron, London WC1E 6BT, England

来源：

ASTROPHYSICAL JOURNAL | 2012年 / 755卷 / 02期

关键词：

infrared: diffuse background; infrared: ISM; ISM: lines and bands; ISM: molecules; MU-M SPECTRA; MOLECULAR-HYDROGEN; ULTRAVIOLET-RADIATION; INTERSTELLAR CLOUDS; INFRARED RESPONSE; ROTATIONAL-EXCITATION; LABORATORY SIMULATION; CARBON NANOPARTICLES; BAND SYSTEM; H-2;

D O I：

10.1088/0004-637X/755/2/119

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Laboratory evidence suggests that recombination of adsorbed radicals may cause an abrupt temperature excursion of a dust grain to about 1000 K. One consequence of this is the rapid desorption of adsorbed H-2 molecules with excitation temperatures of this magnitude. We compute the consequences of injection of hot H-2 into cold diffuse interstellar gas at a rate of 1% of the canonical H-2 formation rate. We find that the level populations of H-2 in J = 3, 4, and 5 are close to observed values, and that the abundances of CH+ and OH formed in reactions with hot hydrogen are close to the values obtained from observations of diffuse clouds.

引用

页数：6

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